#include<stdio.h>
int main()
{ int n, i;
printf("please enter a integer number,n=?");
scanf_s("%d", &n);
for (i = 2; i < n; i++)
	if (n % i == 0)break;
if (i < n)
	printf("%d is not a prime number.\n", n);
else
printf("%d is a prime number.\n", n);
return 0;

}
